66145440245 has 16 divisors (see below), whose sum is σ = 80407095552. Its totient is φ = 52229184960.

The previous prime is 66145440211. The next prime is 66145440247. The reversal of 66145440245 is 54204454166.

It is not a de Polignac number, because 66145440245 - 2⁶ = 66145440181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145440247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365204 + ... + 515426.

It is an arithmetic number, because the mean of its divisors is an integer number (5025443472).

Almost surely, 2^66145440245 is an apocalyptic number.

It is an amenable number.

66145440245 is a deficient number, since it is larger than the sum of its proper divisors (14261655307).

66145440245 is a wasteful number, since it uses less digits than its factorization.

66145440245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151372.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 66145440245 in words is "sixty-six billion, one hundred forty-five million, four hundred forty thousand, two hundred forty-five".